Depends what you collect. If you collect banknotes from around the world, then keep these for your collection. If you don't collect them, then I'd give them to someone in hopes that they will start a collection.

@alurid, I appreciate the link for US Notes. If anyone has a similar resource, for the foreign, please let me know.

Obviously, worth saving, from all the feedback. That said, and FWIW, I inherited these and the coins, I've begun posting about. However, I'm not really much of a collector of coins and/or banknotes from around the world. But rather, I'm in need of cash, so knowing that some are a bit desirable and/or worth more than face value, is encouraging.